Design a HYDRAULIC circuit that:
• produces the following sequence: A+, then B+, then C+, then simultaneously A- and C-, then B-.
• The actuators to use are double-acting cylinders.
• The valves you use must exist (do not invent them from scratch, see the examples and symbol listings).
• You can use 1 or 2 groups if you require it.
• Requires the operator to press 2 pushbuttons (2 different valves, 2 buttons START) at the same time, so you can start working, and they only work if those buttons are pressed. In other words, if the operator removes his finger from any of the 2 buttons, the process will stop immediately (wherever he is).
Hydraulics and Pneumatics Graphic Symbols
CONTROL VALVES
FLOW CONTROL VALVES
CYLINDERS
X
SHUTOFF VALVE SIMPLIFIED SYMBOL
NEEDLE VALVE
SINGLE ACTING, SPRING RETURN
DIRECTIONAL CONTROL VALVES
VALVE
FLOW CONTROL VALVE
SINGLE-END ROD, DOUBLE ACTING
MAIN LINE PILOT LINE EXHAUST OR DRAIN LINE
FILTER OR STRAINER
2-WAY / 2-POSITION
PRESSURE COMPENSATED FLOW CONTROL VALVE
OR LOGIC FUNCTION VALVE
SEPARATOR WITH MANUAL DRAIN
DOUBLE-END ROD, DOUBLE ACTING
3-WAY / 2-POSITION
ENCLOSURE OUTLINE
mX 4-WAY / 2-POSITION
PRESSURE CONTROL VALVES
FLEXIBLE LINE
SEPARATOR WITH AND LOGIC FUNCTION VALVE
LINES CROSSING
HYDRAULIC SEQUENCE VALVE
t
NOILISO-C/AVM-
PNEUMATIC SEQUENCE VALVE
LINES JOINING
FILTER-SEPARATOR
VALVE ACTUATORS
QUICK EXHAUST VALVE
PNEUMATIC FLOW DIRECTION
FILTER-SEPARATOR
MANUAL
HYDRAULIC PRESSURE REDUCING VALVE
PNEUMATIC PRESSURE REDUCING VALVE
HYDRAULIC DRAIN
INSTRUMENTS AND ACCESSORIES
PLAIN ORIFICE UNCONNECTABLE
PRESSURE GAUGE
ORYER
LEVER
HYDRAULIC PRESSURE RELIEF VALVE
CONNECTABLE ORIFICE
PNEUMATIC PRESSURE RELIEF VALVE
LUBRICATOR
PEDAL
FLOWMETER
PNEUMATIC AIR PRESSURE REGULATOR
ENERGY STORAGE AND FLUID STORAGE
WITH TWO CHECK VALVES
DETENT
WITH ONE CHECK VALVE
RESERVOIR VENTED
P
PRESSURE SWITCH
SPRING
AIRLINE ACCESSORIES
PRESSURIZED RESERVOIR
MOTORS AND PUMPS
SOLENOID
MUFFLER
CD
HYDRAULIC AND PNEUMATIC REGULATOR
HYDRAULIC PILOT
FILTER, REGULATOR, PRESSURE GAUGE, AND LUBRICATOR COMPOSITE SYMBOL
VACUUM GENERATOR
PNEUMATIC MOTORS,
ACCUMULATOR SPRING LOADED
PNEUMATIC PILOT
HYDRAULIC AND PNEUMATIC MOTORS
CD
ACCUMULATOR WEIGHTED
SOLENOID PNEUMATIC PILOT
AIR BEARING
FILTER, REGULATOR, PRESSURE GAUGE, AND LUBRICATOR SIMPLIFIED SYMBOL
46
SOLENOID AND PNEUMATIC PILOT
M
ELECTRIC MOTOR
RECEIVER